There've been some absolute classics over the years and i've been meaning to start this thread for ages, but last night was the straw that broke the camels back.

So we're walking home from school and he (almost 7) starts talking about 'poisonous air'
is there any such thing. So I explained to him about gas, and how the gas we cook with is poisonous and if he smells it to hold his breath and go outside or open windows and doors, which led to the topic of infammability and i explained how if you left the gas on for long enough then lit a match the house would blow up, which led to fart gas and methane and how methane is also inflammable.

Now when he feels the need to fart he runs around checking for naked flames for fear of farting and blowing us all to smithereens.